Pythonで抽象基底クラスを使う

code:py

class Person:

def __init__(self, name, device) -> None:

self.name = name

self.device = device

def speak(self, blabla):

print(f"{self.__class__.__name__} said '{blabla}'")

def single_left(self, obj):

print(f"person '{self.name}' ", end="")

self.device.single_left(obj)

class PointingDevice:

def single_left(self):

raise NotImplementedError

class Mouse(PointingDevice):

def single_left(self, obj):

print(f"clicked '{obj}'")

usr = Person("foo", Mouse()

foo = "bar"

usr.single_left(foo)

# person 'foo' clicked 'bar'

code:py

class Mouse(PointingDevice):

# single_left を実装してない

def double_left(self):

pass

# Traceback (most recent call last):

# File "/xxx/abstract.py", line 42, in <module>

# workers = [Person("foo", Mouse()),

# TypeError: Can't instantiate abstract class Mouse with abstract method single_left